<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    *{
      margin: 0;padding: 0;
    }
    .content{
      height: 200px;
      background-color: antiquewhite;
    }
    

    body{
      /* display: grid;
      grid-template-columns: 200px 1fr 200px; */
      width: 100%;
      display: table;
      table-layout: fixed;
    }
    body > div{
      display: table-cell;
    }
    .content{
      width: 100%;
    }
    .left, .right{
      height: 200px;
      width: 200px;
      background-color: aquamarine;
    }
  </style>
</head>
<body>
  <div class="left"></div>
  <div class="content"></div>
  <div class="right"></div>
</body>
</html>